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Debt And Credit Agreements (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 06, 2021 | Dec. 31, 2023 | Dec. 27, 2023 | Aug. 03, 2023 | Aug. 02, 2023 | Dec. 31, 2022
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 180,000 |  | $ 375,000 |
Line of Credit, Maximum Borrowing Capacity after Modification |  | $ 180,000 |  | $ 200,000 |  |
Line of Credit, Maximum Borrowing Capacity after ABL Adjustment Date |  | 125,000 |  |  |  |
Available credit under the Credit Agreement |  | 22,900 |  |  |  |
Short-Term Debt |  | 126,322 |  |  |  | $ 0
Letters of Credit Outstanding, Amount |  | 13,100 |  |  |  |
Debt Issuance Costs, Gross |  | $ 2,600 |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 5.99% |  |  |  |
Cash Dominion Availability after ABL Adjustment Date |  | 12.50% |  |  |  |
Minimum Liquidity under ABL Facility |  | $ 10,000 |  |  |  |
Minimum Availability before ABL Adjustment Date |  | 10.00% |  |  |  |
Minimum Availability after ABL Adjustment Date |  | 20.00% |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.36% |  |  |  |
Debt Instrument, Periodic Payment, Principal |  | $ 1,700 |  |  |  |
Terphane Brazil Loan |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Other Borrowings |  | 20,000 |  |  |  |
Tredegar Intercompany |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Other Borrowings |  | $ 20,000 |  |  |  |
Line of Credit | Adjusted Base Rate |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.50% |  |  |  |  |
Line of Credit | Alternate Base Rate |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |  |  |  |  |

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